西南交通大学学报

Short-Term Load Forecasting Based on Complex Morlet Wavelet SVM

CHEN Weirong, ZHENG Yongkang, DAI Chaohua, WANG Weibo

2009, 22(5): 631-636.

[Abstract](1826)

Abstract:
In view of the advantage of wavelet analyses in subtle feature extraction and the good global optimization ability of cloud theory-based genetic algorithm (CGA),a CGA-based complex Morlet wavelet SVM (support vector machine),called CGA-CMW-SVM for short,was proposed to improve the forecasting precis...

Incremental Clustering Algorithm Based on Rough Reduction for Data Stream

YIN Guisheng, YU Xiang, NING Hui

2009, 22(5): 637-642,653.

[Abstract](1535)

Abstract:
An incremental algorithm based on rough reduction for clustering data stream,named as RICStream (rough incremental clustering stream),was proposed to overcome the shortcoming of the CluStream algorithm,i.e.,the number of clusters must be predefined when it is used and the evolution of data stream ca...

Improved Decision Tree Algorithm Based on Samples Selection

FENG Shaorong, XIAO Wenjun

2009, 22(5): 643-647.

[Abstract](1549)

Abstract:
To raise the accuracy of decision tree classification algorithms,an improved decision tree classification algorithm based on samples selection was proposed by comparing several classical decision tree classification algorithms.This improved algorithm searches better samples through a constantly iter...

Planar IGBT Fabrication and Forward Voltage Drop Calculated by PIN Model

YUAN Shoucai, LIU Yamei

2009, 22(5): 648-653.

[Abstract](2156)

Abstract:
IGBT (insulate gate bipolar transistor) devices with planar processes were designed and fabricated based on planar silicon CMOS (complimentary metal oxide semiconductor)technology equipments and epitaxial silicon substrates.The measured output current-voltage characteristics of the fabricated IGBT d...

Design of Global Sliding-Mode Controlled Buck Converters Based on Equivalent Control

NI Yu, XU Jianping

2009, 22(5): 654-659.

[Abstract](1661)

Abstract:
To simplify the design of sliding-mode controller and improve the robustness of converter systems,the principle and design method of global sliding-mode control were investigated and introduced to the controller design for Buck converters.The main characteristics of Buck converters with global slidi...

Control Laws and Characters of Pulse Train Controlled Buck Converters

QIN Ming, XU Jianping, MU Qingbo

2009, 22(5): 660-666.

[Abstract](1549)

Abstract:
The merits and implementation of voltage mode pulse train (VMPT) and current mode pulse train (CMPT) control techniques for switching DC-DC converters were analyzed by theoretical analysis,simulation and experiment to compare their steady state characters,control regulation and startup process.The r...

Integrity Check Method for Fine-Grained Data Based on Complex Rotary Codes

CHEN Long, FANG Xinlei, WANG Guoyin

2009, 22(5): 667-671.

[Abstract](1582)

Abstract:
To overcome the shortcoming of the existing integrity check methods for fine-grained data and improve the error indication capability,a novel multiple-error indicating method based on the complex rotary codes was proposed.This method checks the integrity of data objects via cross-checking with group...

Fragile Watermarking Algorithm Based on Circular Structure

SONG Wei, HOU Jianjun, LI Zhaohong

2009, 22(5): 672-676.

[Abstract](1518)

Abstract:
To improve the ability of tamper localization of watermarking,a novel fragile watermarking algorithm based on circular structure was proposed.In this algorithm,images are divided into blocks,and the blocks are modulated by the Logistic mapping to generate block watermarks.Then cat mapping is utilize...

Reconstruction of Implicit Surfaces from Uncalibrated Camera Image Sequences

JIANG Yongquan, PENG Qiang, CHEN Jinxiong

2009, 22(5): 677-681,687.

[Abstract](1653)

Abstract:
To improve the quality of 3D geometric models reconstructed from uncalibrated image sequences,a feature tracking algorithm was proposed to match more points among a sequence of images.In the algorithm,a dense grid in the first frame is drawn,and easily tracked feature points near the grid points are...

LMI-Based Robust Stabilization of Linear Uncertain Systems with Input Time-Delay

ZHANG Yougang, LUO Zhiyong

2009, 22(5): 682-687.

[Abstract](1446)

Abstract:
To robust stabilization problems for a linear uncertain system with parametric uncertainties,state delay and input delay were considered,where the parametric uncertainties are norm-bounded,and the state and input delays are time-varying and bounded.For robust stabilization of this system,a memoryles...

Stability and L2-Gain of Linear Parameter-Varying Subsection System

WANG Tao, LI Jikun, LIU Li

2009, 22(5): 688-692.

[Abstract](1723)

Abstract:
In order to reduce conservative performances resulted in by the application of the Lyapunov function to the analysis of a linear parameter-varying system,the relationships of the stability and L2-gain of the system with the subsection and changing rate of parameters were investigated.By considering ...

Linear FM Signal Estimation Method Based on Linear Iterative Prediction

XU Zhengwu, LU Xiaoqian, ZHANG Yang

2009, 22(5): 693-696.

[Abstract](1497)

Abstract:
To enlarge the parameter estimation range in the algorithm for estimation of LFM (linear frequency modulation) signal parameters,and improved algorithm was proposed based on the method of rotate-add-decimate (RAD) for frequency measurement,and it was implemented with the method of linear iterative p...

Damage Mechanism of Reinforced Concrete Frames in Fire

FU Chuanguo, WANG Guangyong, WANG Yuzhuo

2009, 22(5): 697-703,709.

[Abstract](1738)

Abstract:
Based on software ABAQUS,a user material model and subroutine for the analysis of reinforced concrete frame structures in a fire were developed to simulate the cross-section temperature field of reinforced concrete components more accurately.With the incremental theory of plasticity,the non-linear a...

Parameter Identification of Long-Span Cable-Stayed Bridge Based on Grey-Neural Network

MENG Qingcheng, QI Xin, LI Qiao, BU Yizhi

2009, 22(5): 704-709.

[Abstract](1839)

Abstract:
To solve the structural parameter identification problem with measurement noises during the construction process of long-span cable-stayed bridges,an entire-processed parameter identification method based on grey-neural network was proposed.The fusion of the grey system theory and the artificial neu...

Torsion Analysis of Horizontal Curved Box Girder under Temperature Difference

FU Chunyu, LI Qiao

2009, 22(5): 710-715.

[Abstract](1667)

Abstract:
In order to calculate the internal forces and displacements of horizontal curved box girders under temperature difference correctly,the torsion deformations caused by section rotation and temperature difference were analyzed based on the characteristic of the flexure-torsion coupling,and the torsion...

Influences of Lining Stiffness Distribution on Frost Heave Pressure on Cold Regional Tunnels

DENG Gang, WANG Jianyu, ZHENG Jinlong

2009, 22(5): 716-720.

[Abstract](1738)

Abstract:
To ensure that lining has a suitable safety degree,a constrained frost heave model was proposed based on the interaction characteristic of frozen water body,lining and surrounding rock,and the corresponding analytical expression of frost heave pressure was give.A load-structure model was adopted to ...

Fractal Description of Rail Corrugation and Its Dynamic Simulation

WU Zeng, LIU Xueyi, YAO Lingkan

2009, 22(5): 721-725.

[Abstract](1709)

Abstract:
To probe into the method to accurately describe the attrition grade of rail corrugation using fractal dimension,the characteristics of rail corrugation,measured in some segments with a curve radius of 300 m along the Shijiazhuang-Taiyuan railway line,were described by fractal dimension based on expe...

Nonlinear Beam Element with Meshed Sections

ZHOU Lingyuan, LI Tongmei, LI Qiao

2009, 22(5): 726-731.

[Abstract](1748)

Abstract:
Based on the distributed plasticity approach,a new kind of beam element,3-D materially nonlinear beam element with meshed sections,was presented to analyze the materially nonlinear behaviour of frame structures accurately,and a numerical example for the elasto-plastic analysis of a cantilever beam w...

Finite Element Model for Catenary in Initial Equilibrium State

LI Ruiping, ZHOU Ning, MEI Guiming, ZHANG Weihua

2009, 22(5): 732-737.

[Abstract](1685)

Abstract:
Finite element models were established using link and beam elements,respectively,to accurately and quickly calculate the dropper lengths,static stiffness,natural frequencies and mode shapes of catenaries in the initial equilibrium state.The results show that the two element types exert no obvious ef...

Coupled Finite Element Thermal-Mechanical Analysis of Gravity Support System of International Thermonuclear Experimental Reactor

LIANG Shangming, YAN Xijiang, WANG Xianzhou

2009, 22(5): 738-742.

[Abstract](2110)

Abstract:
A method for building the finite element model of the gravity support system of the international thermonuclear experimental reactor (ITER) was put forward according to the structure characteristics of the gravity support system.By this method,a 3D finite element model of the gravity support system ...

Experimental Investigation on Periodical Temperature Field in Active Magnetic Regenerator of Rotary Magnetic Refrigerator

WU Jianghong, WANG Xihui, TANG Yongbo, CHEN Yungui

2009, 22(5): 743-747,793.

[Abstract](1527)

Abstract:
The heat transfer rules between the porous medium and single-phase fluid under the periodical instantaneous heat source in the active magnetic regenerator (AMR) of a rotary magnetic refrigerator were discussed based on temperature field measurement.The experimental results showed that the temperatur...

Adaptive Semiactive Bumper for Aircraft

DONG Xiaomin, YU Miao, LIAO Changrong, CHEN Weimin

2009, 22(5): 748-752.

[Abstract](1541)

Abstract:
To avoid the limitation of traditional aircraft bumpers that their stiffness and damping factors are not adjustable,a new bumper was designed.It consists of a magnetorheological (MR) damper with variable damping factors and a magnetorheological elastomer (MRE) with variable rigidity,and the two part...

Structural Characteristics of New Airborne Mass Flowmeter

HUANG Danping, LIAO Junbi, LIAO Shipeng

2009, 22(5): 753-758.

[Abstract](1416)

Abstract:
The velocity vector flow of aviation fuel oil in the diver and inductive wheel of mass for airborne mass flowmeter was simulated by computational fluid dynamics (CFD) software,and the rotational moment and pressure differences of the diver and the inductive wheel of mass were calculated.Based on the...

Critical Traffic Volume of Traffic Signal Warrant at Major-Minor Intersections

WANG Dianhai, MA Dongfang, CHEN Yongheng

2009, 22(5): 759-763.

[Abstract](1420)

Abstract:
The feasibility of regarding multiple traffic flows as one was demonstrated by probability analysis and gap acceptance theory.On this basis,a model of average vehicle delay was established by queuing theory to find the critical traffic volume of traffic signal warrant at major-minor intersections.Th...

Air Traffic Flow Combinational Forecast Based on Double Gravity Model and Artificial Neural Network

ZHANG Ming, HAN Songchen, HUANG Linyuan

2009, 22(5): 764-770.

[Abstract](1886)

Abstract:
The four stage method and a double gravity model were used to forecast the OD (origin-destination) distribution of air traffic flow in the whole airspace of China.In view of the randomicity and periodicity of historical data of air traffic flow,a GM-GRNN (gray model and generalized regression neural...

Risk Identification for Driving Behaviors Based on Bayesian Discrimination

GUO Zhizheng, CHEN Chongshuang, WANG Xin

2009, 22(5): 771-775.

[Abstract](1730)

Abstract:
To effectively identify risk-state in driving behaviors,they were classified into different grades according to accident probabilities.Main factors for driving behavior were determined by single factor variance analysis.A model for risk-state identification was constructed based on Bayesian discrimi...

Characteristics and Countermeasures of Traffic Accidents in Expressway Tunnel

ZHANG Yuchun, HE Chuan, WU Dexing, ZENG Yanhua

2009, 22(5): 776-781.

[Abstract](1766)

Abstract:
In older to probe into the mechanism and countermeasures of traffic accidents in expressway tunnels,10 expressway tunnels in Zhejiang Province were investigated,and the data of 599 traffic accidents and 5 280 anchorage accidents were collected.Based on these data,composition of traffic accidents,the...

Multi-Objective Genetic Algorithm for Solving Capacitated Vehicle Routing Problems

ZOU Shurong, HUANG Xiaobin, ZHANG Hongwei

2009, 22(5): 782-786.

[Abstract](1795)

Abstract:
A multi-objective genetic algorithm based on Pareto approach was proposed for capacitated vehicle routing problems (CVRPs).In this algorithm,a new Pareto tournament selection operator based on arena’s principle is used to avoid the difficulty of solving non-convex problems;meanwhile,the nearest-neig...

New Tabu Search Algorithm for Large-Scale Vehicle Routing Problem with Simultaneous Deliveries and Pickups

LI Jian, LU Zhixiong, GAO Mourong

2009, 22(5): 787-793.

[Abstract](1496)

Abstract:
A new tabu search algorithm that integrates many neighborhood search methods,and adopts route set-based decomposition,restart and perturbation strategies,was proposed.The current solution is divided into several subsets of routes,each of which is solved by the tabu search algorithm and the best solu...

Relevance of Regional Information Industry to Economic Growth

KE Ling

2009, 22(5): 794-798.

[Abstract](1241)

Abstract:
Using multi-level interpretative structural model (ISM),analysis of the industrial relevance between information departments and other departments was made based on the 2002 input-output tables of 124 departments issued by Statistical Bureau of Sichuan Province.Then,the response coefficients and inf...

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2009 Vol. 22, No. 5